$ git clone -n https://github.com/xcp-ng-rpms/sm.git /var/lib/mock/v8.3-v-qcow2-9430-28177/root/chroot_tmpdir/scmroot/sm
Cloning into '/var/lib/mock/v8.3-v-qcow2-9430-28177/root/chroot_tmpdir/scmroot/sm'...
$ git fetch origin d8fe0c6f5aca47e776c6b48c4d02c742fd87ea86:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/sm
 * [new ref]         d8fe0c6f5aca47e776c6b48c4d02c742fd87ea86 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d8fe0c6 Release 3.2.12-10.2.0.qcow2.1